Doctor think my study is correct of my problem? I think am sure but my physician isn't know squat.?

You are putting the horse before the cart. You are not thirsty because of your A-Fib. Also you need to look up waht intracellular thirst is etc. The excess thirst you describe as having sounds more like a sign of diabetes or your body being dehydrated. For now relax and wait for your cardiologist appointment. ALso just because you feel fatigued does not mean it is related to your A-FIb. It could be caused by tons of other things including anemia or chronic fatigue syndrome.